Amazon Linux 2023 : libsoup3, libsoup3-devel (ALAS2023-2026-1778)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2026-1778.
##

include('compat.inc');

if (description)
{
  script_id(319827);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/12");

  script_cve_id(
    "CVE-2026-0716",
    "CVE-2026-1467",
    "CVE-2026-1760",
    "CVE-2026-1761",
    "CVE-2026-1801",
    "CVE-2026-2436",
    "CVE-2026-2708",
    "CVE-2026-5119"
  );
  script_xref(name:"IAVA", value:"2026-A-0139-S");
  script_xref(name:"IAVA", value:"2026-A-0165-S");
  script_xref(name:"IAVA", value:"2026-A-0429");
  script_xref(name:"IAVA", value:"2026-A-0555");

  script_name(english:"Amazon Linux 2023 : libsoup3, libsoup3-devel (ALAS2023-2026-1778)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2023 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1778 advisory.

    OOB Read via Integer Overflow on libsoup through libsoup/websocket/soup-websocket-connection.c via
    process_frame() leads to Undefined Behavior (CVE-2026-0716)

    A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return
    Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-
    decoded input used to create the Host header. A remote attacker can exploit this by providing a specially
    crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP
    request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy,
    potentially impacting downstream services. (CVE-2026-1467)

    A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer
    improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A
    remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer
    to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional
    requests over the persistent connection, leading to unintended request processing and potential denial-of-
    service (DoS) conditions. (CVE-2026-1760)

    A flaw was found in libsoup. This stack-based buffer overflow vulnerability occurs during the parsing of
    multipart HTTP responses due to an incorrect length calculation. A remote attacker can exploit this by
    sending a specially crafted multipart HTTP response, which can lead to memory corruption. This issue may
    result in application crashes or arbitrary code execution in applications that process untrusted server
    responses, and it does not require authentication or user interaction. (CVE-2026-1761)

    A flaw was found in libsoup, an HTTP client/server library. This HTTP Request Smuggling vulnerability
    arises from non-RFC-compliant parsing in the soup_filter_input_stream_read_line() logic, where libsoup
    accepts malformed chunk headers, such as lone line feed (LF) characters instead of the required carriage
    return and line feed (CRLF). A remote attacker can exploit this without authentication or user interaction
    by sending specially crafted chunked requests. This allows libsoup to parse and process multiple HTTP
    requests from a single network message, potentially leading to information disclosure. (CVE-2026-1801)

    Denial of Service via use-after-free in SoupServer during TLS handshake (CVE-2026-2436)

    libsoup includes an embedded HTTP/1 server. When a server sits behind a proxy / load balancer, it's
    critical that every hop agrees on how request bodies are framed.In the affected code path, libsoup
    accepted HTTP/1 requests with ambiguous body framing:

    multiple Content-Length headers (CL.CL)

    Transfer-Encoding: chunked together with Content-Length (TE+CL)

    Different intermediaries pick different framing rules in these cases. If a front-end and back-end
    disagree, an attacker can desynchronize the connection and smuggle an extra request through the chain.
    Depending on deployment, this can lead to routing/ACL bypass, cache poisoning, or reaching internal-only
    endpoints. (CVE-2026-2708)

    A flaw was found in libsoup. When establishing HTTPS tunnels through a configured HTTP proxy, sensitive
    session cookies are transmitted in cleartext within the initial HTTP CONNECT request. A network-positioned
    attacker or a malicious HTTP proxy can intercept these cookies, leading to potential session hijacking or
    user impersonation. (CVE-2026-5119)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1778.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-0716.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-1467.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-1760.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-1761.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-1801.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-2436.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-2708.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-5119.html");
  script_set_attribute(attribute:"solution", value:
"Run 'dnf update libsoup3 --releasever 2023.12.20260608' or
  or 'dnf update --advisory ALAS2023-2026-1778 --releasever 2023.12.20260608' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:L/SI:L/SA:L");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-5119");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-1761");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/01/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsoup3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsoup3-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsoup3-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsoup3-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsoup3-doc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2023");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Amazon Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");

  exit(0);
}

include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "-2023")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2023", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var pkgs = [
    {'reference':'libsoup3-3.6.6-58.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-3.6.6-58.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-debuginfo-3.6.6-58.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-debuginfo-3.6.6-58.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-debugsource-3.6.6-58.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-debugsource-3.6.6-58.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-devel-3.6.6-58.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-devel-3.6.6-58.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-doc-3.6.6-58.amzn2023', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var _release = NULL;
  var sp = NULL;
  var _cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  var cves = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
    if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libsoup3 / libsoup3-debuginfo / libsoup3-debugsource / etc");
}